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In https://w3c.github.io/webdriver/webdriver-spec.html#getcookie "getCookie" is defined as a POST. This is done so that the name can be passed through. However, since this doesn't change the state of the browser or the session, this would be better modeled as a GET with the name parameter added to the URL. The suggested template would be: /session/{sessionId}/cookie/{name}
https://github.com/w3c/webdriver/commit/22439e03a89124fe15b3e5018e0f388e47759f19